study of the theoretical aspects of music and its notation
8 dated entries naming Music theory, drawn from 8 separate years between 840 CE and 1260 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.
840Hucbald, Frankish music theorist (or 850)source
850Hucbald, Frankish music theorist (or 840)source
10th century
930June 20 – Hucbald, Frankish monk and music theoristsource
991Guido Monaco, Italian monk and music theorist (or 992)source
992Guido Monaco, Italian monk and music theorist (or 991)source
11th century
1013July 18 – Hermann of Reichenau, German music theorist (d. 1054)source
1054September 24 – Hermann of Reichenau, German music theorist (b. 1013)source
13th century
1260German musical theorist Franco of Cologne publishes Ars Cantus Mensurabilis, in which he advances a new theory of musical notation, in which the length of a musical note is denoted by the shape of that note, a system still used today.source